I have a 10 gal divided tank in my bedroom where I keep me two Bettas Countach and Manalo. Yesterday I swapped their spots in the tank just to give them a change of scenery. About 2 hours later I looked in the tank before going to sleep and I could not find Manalo anywhere. I figured he was resting in his castle and out of sight so I switched my gaze to the other half, but when when I looked in I saw two Bettas. Manalo some how managed to jump my divider. My other Betta must have beaten him up pretty bad because he lost a lot of his gorgeous fins. I now have Manalo in a separate tank to rest and relax.

Anything else I should do to help him recover?

I also have a medicine by API called Bettafix. Should use that in Manalo's hospital tank? I feel horrible because if I hadn't swapped their sides I do not think this would have happened.

Yeah I've heard a few people on here talk about betta fix containing tea tree oil which coats the labyrinth which is what they use to breath. Could you maybe post some pictures of him? I know API stress coat is great for torn fins so maybe use some of it.

Just for future reference, you are not the only person on this site who has had this problem when switching their fish's side of the tank. Bettas are extremely territorial and especially if they've built a nest, they are not going to take kindly to switching to another Bettas territory.
But, Bettas are also known jumpers and may jump the barrier whether they've switched sides or not, again, mostly because they're territorial and they see competition on the other side.
And yes, Bettafix (and other -fix medicines) contain tea tree oil which can coat the labyrinth lung and cause the fish to suffocate. The company claims that these deaths are due to the result of overdosing or using the medication for something that it's not intended for (I emailed them personally on this issue) - so I personally, would steer clear of it. Some have used it successfully, others have had their fish die.

Just for future reference, you are not the only person on this site who has had this problem when switching their fish's side of the tank. Bettas are extremely territorial and especially if they've built a nest, they are not going to take kindly to switching to another Bettas territory.
But, Bettas are also known jumpers and may jump the barrier whether they've switched sides or not, again, mostly because they're territorial and they see competition on the other side.
And yes, Bettafix (and other -fix medicines) contain tea tree oil which can coat the labyrinth lung and cause the fish to suffocate. The company claims that these deaths are due to the result of overdosing or using the medication for something that it's not intended for (I emailed them personally on this issue) - so I personally, would steer clear of it. Some have used it successfully, others have had their fish die.

I have never have either of my bettas jump before but he must have done that even though the gap by the lid was only an inch big. I inspected the wall later and there were now gaps on the sides or underneath.

I have never have either of my bettas jump before but he must have done that even though the gap by the lid was only an inch big. I inspected the wall later and there were now gaps on the sides or underneath.

I will also throw away the betta fix. Thanks!

My female jumped through a hole in lid a half an inch big when she was chasing fruit flies. They're amazing jumpers.